Types of Wave Propagation

Question 1

It is a method by which radio waves travel from the transmitting antenna to the receiving antenna.

• The receiving antenna must be located within the radio horizon of the transmitting antenna. In other words, the two (2) antennas mention above must “see” each other.

Answer 1

Line of Sight Propagation Method

Question 2

It is a method by which radio waves are radiated directly towards the earth’s surface. It is used for:

• Worldwide communications with a frequency that ranges from 3 to 30 kHz and 30 to 300 kHz.
• Broadcasting with a frequency that ranges from 300 kHz to 3 Mhz.

Answer 2

Ground Wave (Surface) Propagation Method

Question 3

It is a method by which radio waves radiate upwards from the transmitting antenna of the earth into a direction towards the ionosphere.

• It is used for long-distance radiotelephony and sound broadcasting with a frequency that ranges from 3 Mhz to 300 Mhz

Answer 3

SkyWave (Ionospheric) Progpagation Method

Question 4

It is a method by which radio waves radiation exceeds 30 Mhz up to 300 Ghz.

• It is used for sound/television broadcasting for radio-relay systems and for various mobile systems that operate at a frequency that ranges from 30 to 300 Mhz, 300 Mhz to 3 Ghz, 3 to 30 Ghz

Answer 4

Space Wave (Tropospheric) Proparagation Method